Unit 5: 8051 Interrupts and Interfacing Applications 1. Explain the concept of interrupts in the 8051 microcontroller. (6 Marks) Interrupts are events that temporarily halt the main program execution in the 8051. They allow external devices or internal events to signal the microcontroller for attention. The microcontroller then pauses the current task, saves its state, and executes an Interrupt Service Routine (ISR) specific to the interrupt source. Once the ISR finishes, the microcontroller restores its state and resumes the main program from where it left off. 2. Describe the Interrupt handling mechanism in the 8051. (6 Marks) The 8051 has five interrupt sources: INT0 and INT1: External hardware interrupts on pins P3.2 and P3.3. TF0 and TF1: Timer overflow interrupts from Timer/Counter 0 and 1. RI/TI: Serial communica...
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